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Master's Dissertation
DOI
10.11606/D.54.1992.tde-08042014-164255
Document
Author
Full name
Adriano Mauro Cansian
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1992
Supervisor
Committee
Castro Neto, Jarbas Caiado de (President)
Duarte, Jose Leonil
Sanjurjo, Jose Antonio
Title in Portuguese
Efeitos de saturação em conjugação de fase por mistura degenerada de 4 ondas em cristais dopados com Cr+3
Keywords in Portuguese
Cristais dopados com Cr+3
Mistura de quatro ondas
Óptica não linear
Abstract in Portuguese
Técnicas de Mistura de 4 Ondas foram utilizadas para se estabelecer e observar redes de difração dinâmicas formadas pela população de íons Cr+3 e através disto estudamos os efeitos de saturação em Conjugação de Fase por Mistura Degenerada de 4 Ondas (CFMD40) em cristais de GdAlO3 : Cr+3 (Aluminato de Gadolínio dopado com Cr+3) e Al2O3 : Cr+3 (Rubi). Foi utilizado um laser de Argonio CW em &lambda = 514nm para investigar experimentalmente o comportamento estacionário e transiente da eficiência (ou refletividade) na CFMD40, onde obtivemos um bom acordo com os modelos teóricos utilizados. Pela primeira vez foi registrada a resposta temporal transiente do campo conjugado em CFMD40 para cristais de GdAlO3 : Cr+3, onde foi desenvolvida e utilizada uma nova técnica de medida. Nossos resultados de eficiência estacionaria para o cristal de GdAlO3 : Cr+3 são, segundo nosso conhecimento, os mais altos obtidos neste tipo de material utilizando-se lasers contínuos neste comprimento de onda. Realizamos também um experimento onde podemos comprovar a participação de ambas as redes absorptiva e dispersiva induzida nestes materiais fato este considerado em nosso modelo teórico.
Title in English
Saturation effects in degenerate four wave mixing in Cr+3 dopped crystals
Keywords in English
Cr+3 dopped crystals
Four wave mixing
Nonlinear optics
Abstract in English
Four Wave Mixing techniques were used to establish and probe dynamic gratings generated by Cr+3 ions population. By this method this we have studied the saturation effects in phase conjugation by Degenerate Four- wave Mixing (DFWM) in GdAlO3 : Cr+3 (Cr+3 doped Gadolineum Aluminatum) and Al2O3 : Cr+3 (Ruby). An Argon ion laser at &lambda = 514nm was used to investigate the stationary and transient behavior of efficiency in DFWM, where we have obtained good agreement with the theoretical models. For the first time the transient response of conjugated field by DFWM was measured in a GdAlO3 : Cr+3 crystal, using a new experimental technique. In the GdAlO3 : Cr+3 sample we obtained a maximum DFWM stationary efficiency of approximately 10%, which as far as we know, is the highest value achieved in this kind of material using a CW laser at this wavelength. We have also performed an experiment to probe the both contribution of absorptive and dispersive induced gratings in these materials, as we have considered in our theoretical model.
 
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Publishing Date
2014-04-09
 
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